Other NGL recovery methods include an NGL
fractionation "train" which typically consists of three
distillation towers in a series. The series occurs in the following order:

1.
deethanizer
2. depropanizer
3. debutanizer.

The
overhead product from the deethanizer is ethane - after which the bottoms flow
to the depropanizer. The overhead product from the depropanizer is propane and
the bottoms then flow to the debutanizer. The overhead product from the
debutanizer is a mixture of normal butane and iso-butane. The bottoms products
are a C5+ mixture. Most cryogenic
plants, however, do not include fractionation due to economic
reasons. Therefore the NGL stream is then transported as a mixed product to
separate, standalone fractionation
plants that are located near refineries or chemical plants that need
these NGLs feedstock.

“spending
hundreds and hundreds and hundreds of billions of dollars every year for
oil, much of it from the Middle East, is just about the single stupidest
thing that modern society could possibly do. It’s very difficult to think of anything
more idiotic than that.”
~ R. James Woolsey, Jr., former Director of the CIA

According to R. James Woolsey, for Director of the Central Intelligence Agency, “The basic insight is to realize that global warming, the geopolitics of oil, and warfare in the Persian Gulf are not separate problems — they are aspects of a single problem, the West’s dependence on oil.”